r507a（r125/r143a）
shandong dongyue chemical co., ltd.
domestic sales office：0533-8520226/ 8518777
e-mail：[email protected]
foreign sales office：0533-8510071
e-mail：[email protected]
group website
domestic sales office：0533-8520226/ 8518777
e-mail：[email protected]
foreign sales office：0533-8510071
e-mail：[email protected]
contact us
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